The Supreme Court announced Monday that it will hear arguments in President Donald Trump's travel ban case during its October session.

The Court did leave one category of foreigners protected, those “with a credible claim of a bona fide relationship with a person or entity in the United States,” the court said in an unsigned opinion.

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The 'bona fide' relationship involves individuals with family members or business ties to in the US.

The 90-day ban will affect travelers from six predominately Muslim nations. The ban would apply to citizens of Iran, Libya, Somalia, Sudan, Syria and Yemen.

The action is a victory for President Trump in the biggest legal controversy of his presidency. Trump said last week that the ban would take effect 72 hours being cleared by courts.

"Today's unanimous Supreme Court decision is a clear victory for our national security," the president said in a statement. "It allows the travel suspension for the six terror-prone countries and the refugee suspension to become largely effective."

Attorney General Jeff Sessions says the Justice Department looks forward to defending the travel ban when the Supreme Court hears arguments in the case in October.

Sessions says Monday's decision is "an important step toward restoring the separation of powers between the branches of the federal government" by recognizing the president's right to protect national security.

The court is letting the administration mostly enforce its 90-day ban. The court's opinion said two federal appeals courts that had blocked the policy went too far to limit Trump's authority over immigration.

Three of the court’s conservative justices said they would have let the complete bans take effect.

Justice Clarence Thomas, joined by Justices Samuel Alito and Neil Gorsuch, said the government has shown it is likely to succeed on the merits of the case, and that it will suffer irreparable harm with any interference. Thomas said the government’s interest in preserving national security outweighs any hardship to people denied entry into the country.

Two federal appeals courts had blocked the travel policy, which Trump announced a week after he took office in January and revised in March after setbacks in court.

The 4th U.S. Circuit Court of Appeals in Richmond, Virginia, said the ban was “rooted in religious animus” toward Muslims and pointed to Trump’s campaign promise to impose a ban on Muslims entering the country as well as tweets and remarks he has made since becoming president.

The San Francisco-based 9th U.S. Circuit Court of Appeals said the travel policy does not comply with federal immigration law, including a prohibition on nationality-based discrimination. That court also put a hold on separate aspects of the policy that would keep all refugees out of the United States for 120 days and cut by more than half, from 110,000 to 50,000, the cap on refugees in the current government spending year that ends September 30.